I am using this example to create splash screen for my android app. But the background image is stretching. Below is the code:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/colorPrimary" />
<item>
<bitmap android:src="#drawable/splash_portrait" />
</item>
</layer-list>
How to proportionately scale the bitmap?
The image you use should be a Vector Image.
Vector Images can resize at will and still retain clarity.
If you use normal images, no matter how you implement it, it will either stretch or shrink depending on the mobile screen.
Related
I am building an Android Application that has a :
Splash Screen , which displays the logo of the Application
What is working :
The screen is being displayed perfectly well and is going to FirstActivity as desired if I set a ImageView in a layout for the SplashScreenActivity .
What isn't :
However this isn't the correct approach as it produces a delay when the App starts as layout is being inflated . I have used the recommended approach as follows :
splash.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/black" />
<item
android:gravity="center">
<bitmap
android:src="#drawable/logo"
android:gravity="center"/>
</item>
</layer-list>
styles.xml
<style name="Splash" parent="Theme.AppCompat.NoActionBar">
<item name="android:windowBackground">#drawable/splash</item>
</style>
AndroidManifest.xml
<application
android:theme="#style/Splash">
When i tried to set the bitmap src from mipmap folder it produced a tiny image .
As I also had the SVG file of the logo I tried using Vector Asset to
produce a drawable but bitmap src needs an image and the App crashed .
Then I tried to generate a PNG from SVG using ImageMagick , InkScape
and other tools with their recommended options for high quality images .
But it still isn't as sharp as using a ImageView with a Vector Drawable as its source and finally I can't think of any other way now .
So , how can I achieve the same quality of the image like all other Apps have ? Also is there any way I can make bitmap use the SVG itself ?
#hrk sing is right, dont even bother trying to display a bitmap correctly. you will always get low resolution images. the best you can do is really create a vectordrawable even online on a page such as vectr. what I did is silmply scale the vectordrawable directly in the xml and it finally worked perfectly for my splash screen
<vector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:aapt="http://schemas.android.com/aapt"
android:viewportWidth="640"
android:viewportHeight="640"
android:width="240dp"
android:height="240dp">
<path
android:pathData="M320.96 55.9L477.14 345L161.67 345L320.96 55.9Z"
android:strokeColor="#292929"
android:strokeWidth="24" />
</vector>
in the code above I am rescaling a drawable I drew on a 640x640 canvas to be 240x240. then i just put in in my splash screen drawable like so and it works great:
<?xml version="1.0" encoding="utf-8"?>
<!-- The background color, preferably the same as your normal theme -->
<item>
<shape>
<size android:height="120dp" android:width="120dp"/>
<solid android:color="#android:color/white"/>
</shape>
</item>
<!-- Your product logo - 144dp color version of your app icon -->
<item
android:drawable="#drawable/logo_vect"
android:gravity="center">
</item>
my code is actually only drawing the triangle in the following picture but here you see what you can achieve with this. Resolution is finally great as opposed to the pixelated edges I was getting when using bitmap.
You Should use vector instead of png or jpg
to use vector in android use
app:srcCompat="#drawable/logo"
and you need to add vectorDrawables.useSupportLibrary = true to your build.gradle file
// Gradle Plugin 2.0+
android {
defaultConfig {
vectorDrawables.useSupportLibrary = true
}
}
for more information and usage REFER TO:
https://www.androidhive.info/2017/02/android-working-svg-vector-drawables/
Is there any xml that i can use to perform something like this ?
I want to have an single ImageView where i show my picture. The picture is "fillparent" that it goes on the whole screen. But i only want to see the pink part normal and all outside the lines i want something like an "alpha = 0.5" or just that it is a little bit less seen than the main.
<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:top="120px" android:right="120px" android:bottom="120px" android:left="120px">
<shape android:shape="rectangle">
<solid android:color="#9fffffff" />
</shape>
</item>
I want to put an xml as foreground to perform this. With an shape of an rectangle and an alpha of 0.5 it works exactly the opposite side. Now i just need something like an inverse rectangle or something.
Thanks for your time.
I'm trying to center a drawable image with some padding on either side to use as a splash screen logo. The problem is it's either stretched across the entire screen or ignores any padding if I use gravity.
<?xml version="1.0" encoding="utf-8"?>
<item
android:drawable="#color/grey_3"/>
<item android:gravity="top|center_horizontal|center_vertical" android:drawable="#drawable/zc_logo_r"
android:top="100dp"
android:left="200dp"
android:right="200dp"
android:layout_margin="100dp"
>
</item>
I've tried using a bitmap, android:gravity="fill_horizontal" and various other suggestions on SO with the same result.
How can I scale and center the image in my xml?
As a reference, if you come across the same issue, I solved it with a square image in drawable folders (i.e. hdpi, mdpi, xhpi, xxhpi and xxxhdpi) instead of resizing a rectangular image which was too big in size and gets distorted.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/grey_3"/>
<item android:gravity="center">
<bitmap android:src="#drawable/splash_logo"/>
</item>
</layer-list>
It's probably easiest to turn your drawable image into a nine-patch.
The problem you're running into is that a layer-list doesn't have an intrinsic idea of it's size. The bounds are set when it is placed inside of a container. The xml attributes are set at compile-time so it's difficult to get dynamic values inside of the xml drawable.
If you can use an ImageView, then you can set your drawable in the src attribute and use padding, margins and scaleType to control the position an scaling of the drawable.
I am attempting to use a VectorDrawable in a LayerList without scaling the vector. For example:
<layer-list>
<item android:drawable="#color/grid_item_activated"/>
<item android:gravity="center" android:drawable="#drawable/ic_check_white_48dp"/>
</layer-list>
The drawable ic_check_white_48dp id defined as:
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
<path
android:fillColor="#FFFFFFFF"
android:pathData="M9,16.17L4.83,12l-1.42,1.41L9,19 21,7l-1.41,-1.41z"/>
</vector>
The desired effect is for the check icon to be centered in the layer drawable, without scaling. The issue is, the layer-list above causes the check icon to be scaled to fit the layer size.
I can produce the desired effect if I replace the vector drawable with PNGs for each density and modify the layer-list as such:
<layer-list>
<item android:drawable="#color/grid_item_activated"/>
<item>
<bitmap android:gravity="center" android:src="#drawable/ic_check_white_48dp"/>
</item>
</layer-list>
Is there any way I can do this using a VectorDrawable?
I ran into the same problem trying to center vectors drawables on a layered list.
I have a workaround, its not exactly the same but it works, you need to set a size for the entire drawable and add padding to the vector item:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<size android:height="120dp" android:width="120dp"/>
<solid android:color="#color/grid_item_activated"/>
</shape>
</item>
<item android:top="24dp"
android:bottom="24dp"
android:left="24dp"
android:right="24dp"
android:drawable="#drawable/ic_check_white_48dp"/>
</layer-list>
The size of the shape above sets the size of the entire drawable, 120dp in this example, the padding on the second item, 24dp in this example, centers the vector image.
Its not the same as using the gravity="center" but its working way of using vectors in API 21 and 22.
Been struggling with the same problem. The only way I found to fix this and avoid the drawable to scale up was to set the drawable size and using gravity to align it:
<layer-list>
<item android:drawable="#color/grid_item_activated"/>
<item
android:gravity="center"
android:width="48dp"
android:height="48dp"
android:drawable="#drawable/ic_check_white_48dp"/>
</layer-list>
Hope it helps!
Edited solution that will make your SplashScreen look great on all APIs including API21 to API23
First of all read this article and follow the GOOD way of making a splash screen.
If your logo is distorted or wont fit and you are only targeting APIs24+ you can simply scale down your vector drawable directly in its xml file like so:
<vector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:aapt="http://schemas.android.com/aapt"
android:viewportWidth="640"
android:viewportHeight="640"
android:width="240dp"
android:height="240dp">
<path
android:pathData="M320.96 55.9L477.14 345L161.67 345L320.96 55.9Z"
android:strokeColor="#292929"
android:strokeWidth="24" />
</vector>
in the code above I am rescaling a drawable I drew on a 640x640 canvas to be 240x240. then i just put it in my splash screen drawable like so and it works great:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:opacity="opaque"
android:paddingBottom="20dp" android:paddingRight="20dp" android:paddingLeft="20dp" android:paddingTop="20dp">
<!-- The background color, preferably the same as your normal theme -->
<item>
<shape>
<size android:height="120dp" android:width="120dp"/>
<solid android:color="#android:color/white"/>
</shape>
</item>
<!-- Your product logo - 144dp color version of your app icon -->
<item
android:drawable="#drawable/logo_vect"
android:gravity="center">
</item>
</layer-list>
my code is actually only drawing the triangle in the picture at the bottom but here you see what you can achieve with this. Resolution is finally great as opposed to the pixelated edges I was getting when using bitmap. so use a vector drawable by all means (there is a site called vectr that I used to create mine without the hasle of downloading specialized software).
EDIT in order to make it work also on API21-22-23
While the solution above works for devices runing API24+ I got really disappointed after installing my app a device running API22. I noticed that the splashscreen was again trying to fill the entire view and looking like shit. After tearing my eyebrows out for half a day I finally brute-forced a solution by sheer willpower.
you need to create a second file named exactly like the splashscreen xml (lets say splash_screen.xml) and place it into 2 folders called drawable-v22 and drawable-v21 that you will create in the res/ folder (in order to see them you have to change your project view from Android to Project). This serves to tell your phone to redirect to files placed in those folders whenever the relevant device runs an API corresponding to the -vXX suffix in the drawable folder, see this link. place the following code in the Layer-list of the splash_screen.xml file that you create in these folders:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:opacity="opaque">
<!-- The background color, preferably the same as your normal theme -->
<item
android:gravity="center">
<shape android:shape="rectangle">
<solid android:color="#android:color/white"/>
</shape>
</item>
<!-- Your product logo - 144dp color version of your app icon -->
<item
android:gravity="center">
<bitmap
android:gravity="center"
android:src="#drawable/logo_vect"/>
</item>
</layer-list>
For some reason for these APIs you have to wrap your drawable in a bitmap in order to make it work and jet the final result looks the same. The issue is that you have to use the aproach with the aditional drawable folders as the second version of the splash_screen.xml file will lead to your splash screen not being shown at all on devices running APIs higher than 23. You might also have to place the first version of the splash_screen.xml into drawable-v24 as android defaults to the closest drawable-vXX folder it can find for resources.
I'm currently working on a splash screen with a vector drawable centered both horizontally and vertically. Here is what I got on API level 25:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:opacity="opaque">
<!-- background color, same as theme -->
<item android:drawable="#android:color/white"/>
<!-- app logo -->
<item
android:drawable="#drawable/my_app_logo"
android:gravity="center_horizontal|center_vertical"
android:width="200dp"
android:height="200dp"
/>
</layer-list>
If you want to adjust the vector drawable's dimension, modify android:width and android:height attributes above, not necessarily modify the original drawable.
In addition, my experience is DO NOT put the vector drawable in a bitmap tag, which never works for me. Bitmap is for .png, .jpg and .gif format file, not for vector drawable.
Reference
https://developer.android.com/guide/topics/resources/drawable-resource#LayerList
https://developer.android.com/guide/topics/resources/more-resources.html#Dimension
I have many different dynamic icons in my Android app and I would like to put a rectangular frame around all of them. I tried to use LayerDrawable but I think it scales the smaller drawable to the size of the larger one so in the end the icons overlap with the frame instead of within it. (the icon drawables are 64x64 while the frame drawable is 96x96). Is there an way to enlarge the transparent background of the icon drawables to the same size as the frame drawable without scaling the actual icon?
Any help would be appreciated!
You should be able to use a LayerDrawable for this; just tested it myself and it seems to work just fine. Define the frame first, then add another item with the specified insets.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#FF0000"/>
</shape>
</item>
<item android:left="20dp" android:top="20dp" android:bottom="20dp" android:right="20dp">
<bitmap android:src="#drawable/ic_launcher"/>
</item>
</layer-list>